Meissner response of a bulk superconductor with an embedded sheet of reduced penetration depth
John R. Kirtley, Beena Kalisky, Lan Luan, Kathryn A. Moler
DOI 10.1103/PhysRevB.81.184514 · Physical Review B
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Abstract
We calculate the change in susceptibility resulting from a thin sheet with reduced penetration depth embedded perpendicular to the surface of an isotropic superconductor, in a geometry applicable to scanning superconducting quantum interference device microscopy, by numerically solving Maxwell’s and London’s equations using the finite-element method. The predicted stripes in susceptibility agree well in shape with the observations of Kalisky et al. [Phys. Rev. B 81, 184513 (2010)] of enhanced susceptibility above twin planes in the underdoped pnictide superconductor Ba(Fe1−xCox)2As2. By comparing the predicted stripe amplitudes with experiment and using the London relation between penetration depth and superfluid density, we estimate the enhanced Cooper-pair density on the twin planes, and the barrier force for a vortex to cross a twin plane. Fits to the observed temperature dependence of the stripe amplitude suggest that the twin planes have a higher critical temperature than the bulk, although stripes are not observed above the bulk critical temperature.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Ba(Fe1-xCox)2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 18.25 | Pressure not reported | unknown |
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